/*
 * --------------------------------------------------------------------
 * jQuery-Plugin - selectToUISlider - creates a UI slider component from a select element(s)
 * by Scott Jehl, scott@filamentgroup.com
 * http://www.filamentgroup.com
 * reference article: http://www.filamentgroup.com/lab/update_jquery_ui_16_slider_from_a_select_element/
 * demo page: http://www.filamentgroup.com/examples/slider_v2/index.html
 *
 * Copyright (c) 2008 Filament Group, Inc
 * Dual licensed under the MIT (filamentgroup.com/examples/mit-license.txt) and GPL (filamentgroup.com/examples/gpl-license.txt) licenses.
 *
 * Usage Notes: please refer to our article above for documentation
 *
 * --------------------------------------------------------------------
 */


jQuery.fn.selectToUISlider = function(settings){
    var selects = jQuery(this);

    //accessible slider options
    var options = jQuery.extend({
        labels: 3, //number of visible labels
        tooltip: true, //show tooltips, boolean
        tooltipSrc: 'text',//accepts 'value' as well
        labelSrc: 'value',//accepts 'value' as well	,
        sliderOptions: null
    }, settings);


    //handle ID attrs - selects each need IDs for handles to find them
    var handleIds = (function(){
        var tempArr = [];
        selects.each(function(){
            tempArr.push('handle_'+jQuery(this).attr('id'));
        });
        return tempArr;
    })();

    //array of all option elements in select element (ignores optgroups)
    var selectOptions = (function(){
        var opts = [];
        selects.eq(0).find('option').each(function(){
            opts.push({
                value: jQuery(this).attr('value'),
                text: jQuery(this).text()
            });
        });
        return opts;
    })();

    //array of opt groups if present
    var groups = (function(){
        if(selects.eq(0).find('optgroup').size()>0){
            var groupedData = [];
            selects.eq(0).find('optgroup').each(function(i){
                groupedData[i] = {};
                groupedData[i].label = jQuery(this).attr('label');
                groupedData[i].options = [];
                jQuery(this).find('option').each(function(){
                    groupedData[i].options.push({text: jQuery(this).text(), value: jQuery(this).attr('value')});
                });
            });
            return groupedData;
        }
        else return null;
    })();

    //check if obj is array
    function isArray(obj) {
        return obj.constructor == Array;
    }
    //return tooltip text from option index
    function ttText(optIndex){
        return (options.tooltipSrc == 'text') ? selectOptions[optIndex].text : selectOptions[optIndex].value;
    }

    //plugin-generated slider options (can be overridden)
    var sliderOptions = {
        step: 1,
        min: 0,
        orientation: 'horizontal',
        max: selectOptions.length-1,
        range: selects.length > 1,//multiple select elements = true
        slide: function(e, ui) {//slide function
            var thisHandle = jQuery(ui.handle);
            //handle feedback
            var textval = ttText(ui.value);
            thisHandle
                .attr('aria-valuetext', textval)
                .attr('aria-valuenow', ui.value)
                .find('.ui-slider-tooltip .ttContent')
                .text( textval );

            //control original select menu
            var currSelect = jQuery('#' + thisHandle.attr('id').split('handle_')[1]);
            selects.find('option').attr('selected', false);
            currSelect.find('option').eq(ui.value).attr('selected', 'selected');

            jQuery('#text-' + thisHandle.attr('id')).html(textval);
            selects.trigger("change");
            selects.siblings(".ui-corner-all").find("li").find(".ui-widget-content").removeClass("over");
            selects.siblings(".ui-corner-all").find("li").each(function(i){
                if(i <= ui.value){
                    $(this).find(".ui-widget-content").addClass("over");
                }
            });
            var _left = selects.siblings(".ui-corner-all").find("li").eq(ui.value).css('left');
            sliderComponent.find(".ui-widget-content-over").css('width',_left);
        },
        values: (function(){
            var values = [];
            selects.each(function(){
                values.push( jQuery(this).get(0).selectedIndex );
            });
            return values;
        })()
    };

    //slider options from settings
    options.sliderOptions = (settings) ? jQuery.extend(sliderOptions, settings.sliderOptions) : sliderOptions;

    //select element change event
    selects.bind('change keyup click', function(){
        
        var thisIndex = jQuery(this).get(0).selectedIndex;
        var thisHandle = jQuery('#handle_'+ jQuery(this).attr('id'));
        var handleIndex = thisHandle.data('handleNum');

        jQuery('#text-handle_' +jQuery(this).attr('id')).html(jQuery(this).find("option:selected").text());
        thisHandle.parents('.ui-slider:eq(0)').slider("values", handleIndex, thisIndex);
        selects.siblings(".ui-corner-all").find("li").find(".ui-widget-content").removeClass("over");
        var _left = selects.siblings(".ui-corner-all").find("li").eq(thisIndex).css('left');
        sliderComponent.find(".ui-widget-content-over").css('width',_left);
    });


    //create slider component div
    var sliderComponent = jQuery('<div></div>');

    //CREATE HANDLES
    selects.each(function(i){
        var hidett = '';

        //associate label for ARIA
        var thisLabel = jQuery('label[for=' + jQuery(this).attr('id') +']');
        //labelled by aria doesn't seem to work on slider handle. Using title attr as backup
        var labelText = (thisLabel.size()>0) ? 'Slider control for '+ thisLabel.text()+'' : '';
        var thisLabelId = thisLabel.attr('id') || thisLabel.attr('id', 'label_'+handleIds[i]).attr('id');


        if( options.tooltip == false ){hidett = ' style="display: none;"';}
        jQuery('<a '+
            'href="#" tabindex="0" '+
            'id="'+handleIds[i]+'" '+
            'class="ui-slider-handle" '+
            'role="slider" '+
            'aria-labelledby="'+thisLabelId+'" '+
            'aria-valuemin="'+options.sliderOptions.min+'" '+
            'aria-valuemax="'+options.sliderOptions.max+'" '+
            'aria-valuenow="'+options.sliderOptions.values[i]+'" '+
            'aria-valuetext="'+ttText(options.sliderOptions.values[i])+'" '+
            '><span class="screenReaderContext">'+labelText+'</span>'+
            '</a>')
            .data('handleNum',i)
            .appendTo(sliderComponent);
        jQuery('#text-' +handleIds[i]).html(ttText(options.sliderOptions.values[i]));
       //alert('sdf');
    });

    //CREATE SCALE AND TICS

    //write dl if there are optgroups
    if(groups) {
        var inc = 0;
        var scale = sliderComponent.append('<dl class="ui-slider-scale ui-helper-reset" role="presentation"></dl>').find('.ui-slider-scale:eq(0)');
        jQuery(groups).each(function(h){
            scale.append('<dt style="width: '+ (100/groups.length).toFixed(2) +'%' +'; left:'+ (h/(groups.length-1) * 100).toFixed(2)  +'%' +'"><span>'+this.label+'</span></dt>');//class name becomes camelCased label
            var groupOpts = this.options;
            jQuery(this.options).each(function(i){
                var style = (inc == 0) ? 'style="left: 0em;"' : '' ;
                var labelText = (options.labelSrc == 'text') ? groupOpts[i].text : groupOpts[i].value;
                //scale.append('<dd style="left:'+ leftVal(inc) +'"><span class="ui-slider-label">'+ labelText +'</span><span class="ui-slider-tic ui-widget-content"'+ style +'></span></dd>');
                scale.append('<dd style="left:'+ leftVal(inc) +'"><span class="ui-slider-label"></span><span class="ui-slider-tic ui-widget-content"'+ style +'></span></dd>');
                inc++;
            });
        });
    }
    //write ol
    else {
        var scale = sliderComponent.append('<ol class="ui-slider-scale ui-helper-reset" role="presentation"></ol>').find('.ui-slider-scale:eq(0)');
        jQuery(selectOptions).each(function(i){
            var style = (i == 0) ? 'style="left: 0em;"' : '' ;
            var labelText = (options.labelSrc == 'text') ? this.text : this.value;
            //scale.append('<li style="left:'+ leftVal(i) +'"><span class="ui-slider-label">'+ labelText +'</span><span class="ui-slider-tic ui-widget-content"'+ style +'></span></li>');
            scale.append('<li style="left:'+ leftVal(i) +'"><span class="ui-slider-label"></span><span class="ui-slider-tic ui-widget-content"'+ style +'></span></li>');
        });
    }
    
    function leftVal(i){
        return (i/(selectOptions.length-1) * 100).toFixed(2)  +'%';

    }




    //show and hide labels depending on labels pref
    //show the last one if there are more than 1 specified
    if(options.labels > 1) sliderComponent.find('.ui-slider-scale li:last span.ui-slider-label, .ui-slider-scale dd:last span.ui-slider-label').addClass('ui-slider-label-show');

    //set increment
    var increm = Math.max(1, Math.round(selectOptions.length / options.labels));
    //show em based on inc
    for(var j=0; j<selectOptions.length; j+=increm){
        if((selectOptions.length - j) > increm){//don't show if it's too close to the end label
            sliderComponent.find('.ui-slider-scale li:eq('+ j +') span.ui-slider-label, .ui-slider-scale dd:eq('+ j +') span.ui-slider-label').addClass('ui-slider-label-show');
        }
    }
    sliderComponent.append('<div class="ui-slider ui-slider-horizontal ui-widget ui-widget-content ui-widget-content-over ui-corner-all" role="application"></div>');
    selects.after('<div class="lc-number"><span class="txt-left">10,000</span><span>15,000</span><span>20,000</span><span class="txt-right">25,000</span></div>');
    //style the dt's
    sliderComponent.find('.ui-slider-scale dt').each(function(i){
        jQuery(this).css({
            'left': ((100 /( groups.length))*i).toFixed(2) + '%'
        });
    });


    //inject and return
    sliderComponent
        .insertAfter(jQuery(this).eq(this.length-1))
        .slider(options.sliderOptions)
        .attr('role','application')
        .find('.ui-slider-label')
        .each(function(){
            jQuery(this).css('marginLeft', -jQuery(this).width()/2);
        });

    //update tooltip arrow inner color
    sliderComponent.find('.ui-tooltip-pointer-down-inner').each(function(){
        var bWidth = jQuery('.ui-tooltip-pointer-down-inner').css('borderTopWidth');
        var bColor = jQuery(this).parents('.ui-slider-tooltip').css('backgroundColor')
        jQuery(this).css('border-top', bWidth+' solid '+bColor);
    });

    var values = sliderComponent.slider('values');

    if(isArray(values)){
        jQuery(values).each(function(i){
            sliderComponent.find('.ui-slider-tooltip .ttContent').eq(i).text( ttText(this) );
        });
    }
    else {
        sliderComponent.find('.ui-slider-tooltip .ttContent').eq(0).text( ttText(values) );
    }
    
    return this;
}

